基于偏移矩阵检校的SPOT-5遥感影像高精度直接定位

The High Precision Direct Georeferencing of SPOT-5 Remote-Sensing Imagery Based on Bias Matrix Calibration

对于高分辨率遥感卫星,由于相机与卫星平台之间存在安装偏差而导致相机坐标系和卫星本体坐标系之间的不一致性,以及星历和姿态数据误差等综合误差将会对影像的定位精度产生影响。通过建立偏移矩阵检校模型,利用至少两个控制点对偏移矩阵进行检校,将检校的偏移矩阵用于影像直接定位可以提高定位精度。利用SPOT-5某地区影像数据对模型进行了实验验证,结果表明,偏移矩阵检校模型可以很好地减弱影像系统误差,从而验证了模型的可行性和正确性。

For high resolution remote-sensing satellites,the inconsistency between the camera coordinate system and the satellite body coordinate system can＇t be neglected because of the displacement error between the camera and satellite platform,and the impact on the direct positioning accuracy will be caused by the comprehensive errors of ephemeris and attitude data error,etc.The bias matrix calibration model was established and was calibrated with at least two control points.The direct positioning accuracy can be improved by using the calibrated bias matrix.A certain area SPOT-5 imagery was used in the experiment to testify the proposed model,the result showed that the systematic error of imagery can be reduced by using the bias matrix calibration model,and its feasibility and validity was verified.